The correct response is: The North was most prepared because it industrialized while the South remained agricultural, giving the North better access to the cash needed to fund the war.
This is because the North had a more developed industrial economy, which allowed it to produce weapons, ammunition, and other supplies necessary for sustaining large armies. Additionally, the North's industrial base provided better financial resources and infrastructure, such as railroads, to support troop movements and logistics. In contrast, the South, while having some agricultural advantages, struggled with these logistical and industrial capabilities.